中文摘要：

NiTi形状记忆合金（简称SMA）的材料性能优越，但对其球节点球形式的应力、应变分布规律及承载力等方面的研究还是一片空白。该研究中，以唯象学模型为基础，选用双线性等向强化塑性模型，并使用等向强化屈服准则，分析了静荷载和地震波两种类型荷载，得出：（1）SMA材料球节点弹性变形大，可较好地缓解外荷载所带来的破坏影响；（2）SMA球节点具有良好的延展和韧性特性，是一种典型的延性结构体系；（3）SMA球节点可有效地抑制球节点结构在地震荷载下的响应。

英文摘要：

NiTi shape memory alloy （SMA） has superior material property, but no research has been made on stress, strain distribution law and bearing capacity of spheric node made of NiTi alloy. This research is based on the phenomenological model and uses bilinear isotropic reinforcing plastic model and isotropic reinforcing yield rule to analyze static load and seismic wave and the research results find that：（1） SMA spheric node has strong elastic deformation and could favorably alleviate the damage influence caused by external load; （2） SMA spheric node has favorable ductibility and tenacity, it is a typical ductile structure system; （3） SMA spheric node could effectively prevent the response of spheric node structure under earthquake load.